Zitsanzo za mphamvu zomwe zingatheke komanso mphamvu ya kinetic

Zitsanzo 8 za mphamvu zomwe zingatheke komanso mphamvu ya kinetic

1. Onani chithunzi chili pansipa!

Chinthu A chili ndi kulemera kwa magalamu 1.500 ndipo chili pamalo omwe akuwonetsedwa pachithunzichi. Patapita kanthawi, chinthucho chimagwa pansi. Mphamvu zomwe zingatheke chinthu chachikulu kwambiri chomwe chili ndi A ndi... (zikudziwika kuti g lapansi = 10 m/s²)

A. 15 Joule

B. 200 Joule

C. 300 Joule

D. 30.000 Joule

Zokambirana

Amadziwika kuti:

Lembani magawo onse mu International System

Kuthamanga chifukwa cha mphamvu yokoka (g) = 10 m/s ²

Kulemera kwa chinthu (m) = 1500 magalamu = 1500/1000 makilogalamu = 1,5 makilogalamu

Kutalika (h) = mamita 20

Funso: Mphamvu yothekera ya chinthu A

Yankho:

Chinthu A chimakhala ndi mphamvu yayikulu kwambiri chikakhala pamalo ake apamwamba kwambiri, omwe ali mamita 20 kuchokera pamwamba pa nthaka, ndipo chimakhala ndi mphamvu yochepa kwambiri chikakhala pamalo ake pansi.

Mphamvu ya chinthu imawerengedwa pogwiritsa ntchito njira ya mphamvu yokoka:

EP = mgh = (1,5 kg)(10 m/s ² )(20 m) = 300 kg m ² /s ² = 300 Joules

Yankho lolondola ndi C.

2. Chipolopolo cholemera magalamu 10 chimayenda pa liwiro la 100 m/s. Mphamvu ya kayendedwe ka chipolopolo ndi…..

A. 50 Joule

B. 1.000 Joule

C. 10.000 Joule

D. 50.000 Joule

Zokambirana

Amadziwika kuti:

Kulemera kwa chipolopolo (m) = magalamu 10 = 10/1000 kilogalamu = 1/100 kilogalamu = 0,01 kilogalamu

Liwiro la chipolopolo (v) = mamita 100/sekondi

Funso: Mphamvu ya kinetic ya chipolopolo

Yankho:

Mphamvu ya kinetic ya chipolopolo imawerengedwa pogwiritsa ntchito njira ya kinetic energy:

EK = 1/2 mv ²

EK = 1/2 (0,01 kg)(100 m/s) ²

EK = 1/2 (0,01kg)(10.000 m ² /s ² )

EK = (0,01kg)(5000 m ² /s ² )

EK = 50 kg m ² /s ²

EK = 50 Joule

Yankho lolondola ndi A.

3. Galimoto A ndi galimoto B ali ndi kulemera kofanana. Magalimoto onse awiri amayenda ndi mphamvu yosiyana ya kinetic. Ngati mphamvu ya kinetic ya galimoto A poyerekeza ndi mphamvu ya kinetic ya galimoto B ndi 4:9, ndiye kuti liwiro la galimoto A poyerekeza ndi liwiro la galimoto B ndi….

A. 2: 3
B. 3: 2
C. 4: 9
D. 9: 4

Zokambirana

Amadziwika kuti:
Mphamvu ya kinetic ya galimoto A (EK)_A= = 4
Mphamvu ya kinetic ya galimoto B (EK)_B= = 9
Kulemera kwa galimoto A (m)_A) = kulemera kwa galimoto B (m_B) = m
Funso: Liwiro la galimoto A poyerekeza ndi liwiro la galimoto B
Yankho:

Tiyerekeze kuti kulemera kwa galimoto A = kulemera kwa galimoto B = m = 1
Mphamvu ya kinetic ya galimoto A:
EK = ½ mv² —-> Fomula ya mphamvu ya kinetic
4 = ½ (1) v²
(2)(4) = v²
v_A = √(2)(4)
Mphamvu ya kinetic ya galimoto B:
EK = ½ mv² —-> Fomula ya mphamvu ya kinetic
9 = ½ (1) v²
(2)(9) = v²
v_B = √(2)(9)
Kuyerekeza liwiro la galimoto A ndi galimoto B:
v_A : mu_B
√(2)(4) : √(2)(9)
2√2 : 3√2
2: 3
Yankho lolondola ndi A.

4. Zinthu ziwiri A ndi B zili ndi kulemera kofanana. Chinthu A chimayenda ndi mphamvu ya kinetic ya 4 J ndi B ndi mphamvu ya kinetic ya 16 J. Chiŵerengero cha liwiro la chinthu A mpaka B ndi….

A. 1: 2
B. 1: 4
C. 2: 1
D. 4: 1

Zokambirana
Amadziwika kuti:
Mphamvu ya kinetic ya chinthu A (EK)_A) = 4 Joule
Mphamvu ya kinetic ya chinthu B (EK)_B) = 16 Joule
Unyinji wa chinthu A (m_A) = kulemera kwa chinthu B (m_B) = m
Funso: Kuyerekeza liwiro la chinthu A ndi liwiro la chinthu B
Yankho:
Tiyerekeze kuti kulemera kwa chinthu A = kulemera kwa chinthu B = m = 1
Mphamvu ya kinetic ya chinthu A:
EK = ½ mv² —-> Fomula ya mphamvu ya kinetic
4 = ½ (1) v²
(2)(4) = v²
v_A = √(2)(4)
Mphamvu ya kinetic ya chinthu B:
EK = ½ mv² —-> Fomula ya mphamvu ya kinetic
16 = ½ (1) v²
(2)(16) = v²
v_B = √(2)(16)
Kuyerekeza liwiro la galimoto A ndi galimoto B:
v_A : mu_B
√(2)(4) : √(2)(16)
2√2 : 4√2
2: 4
1: 2
Yankho lolondola ndi A.

5. Zinthu ziwiri zokhala ndi kulemera komweko zikuyenda. Chiŵerengero cha mphamvu ya kinetic ya chinthu choyamba ndi chachiwiri ndi 1:4. Chiŵerengero cha liwiro la chinthu choyamba ndi chinthu chachiwiri ndi….
A. 1: 2
B. 1: 4
C. 2: 1
D. 4: 1
Zokambirana
Amadziwika kuti:
Mphamvu ya kinetic ya chinthu choyamba (EK)₁= = 1
Mphamvu ya kinetic ya chinthu chachiwiri (EK)₂= = 4
Kulemera kwa chinthu choyamba (m₁) = kulemera kwa chinthu chachiwiri (m₂) = m
Funso: Kuyerekeza liwiro la chinthu choyamba ndi liwiro la chinthu chachiwiri
Yankho:
Tiyerekeze kuti kulemera kwa chinthu choyamba = kulemera kwa chinthu chachiwiri = m = 1
Mphamvu ya kinetic ya chinthu choyamba:
EK = ½ mv² —-> Fomula ya mphamvu ya kinetic
1 = ½ (1) v²
(2)(1) = v²
2 = v²
v_A = √2
Mphamvu ya kinetic ya chinthu chachiwiri:
EK = ½ mv² —-> Fomula ya mphamvu ya kinetic
4 = ½ (1) v²
(2)(4) = v²
v_B = √(2)(4)
Kuyerekeza liwiro la galimoto A ndi galimoto B:
v₁ : mu₂
√2 : √(2)(4)
√2 : 2√2
1: 2
Yankho lolondola ndi A.

6. Chipika chimatsetsereka pamalo opendekeka pa liwiro losasintha. Kusintha kwa mphamvu komwe kumachitika ndi…

A. mphamvu yothekera → mphamvu ya kinetic

B. mphamvu ya kinetic → mphamvu yothekera

C. mphamvu yothekera → mphamvu ya kutentha

D. mphamvu ya kinetic → mphamvu ya kutentha

E. mphamvu ya kutentha → mphamvu ya kinetic

Zokambirana

Ngati chipika chitsika pansi pamalo opendekeka, kuchokera pamwamba mpaka pansi, ndiye kuti mphamvu yokoka imasanduka mphamvu ya kinetic.

Yankho lolondola ndi A.

Yang'anani dera lomwe lili pachithunzichi.

7. Pendulum ya masamu imapatsidwa kusuntha koyamba kenako imasinthasintha mofanana monga momwe zasonyezedwera pachithunzichi. Ngati mfundo yofotokozera poyesa mphamvu yomwe ingakhalepo ndi mfundo C, ndi chiganizo chiti chomwe chili cholondola?

(1) Mphamvu ya kinetic ya pendulum pa mfundo A' ndi yofanana ndi mphamvu ya kinetic ya pendulum pa mfundo B'.

(2) Mphamvu yomwe ingatheke ya pendulum pa mfundo A' ndi yofanana ndi mphamvu yomwe ingatheke ya pendulum pa mfundo B'.

(3) Kusiyana kwa mphamvu ya kinetic ya pendulum pa mfundo A' ndi A ndi kofanana ndi kusiyana kwa mphamvu ya pendulum pa mfundo B' ndi B.

(4) Liwiro la pendulum pa mfundo A' ndi lofanana ndi liwiro la pendulum pa mfundo B.

Zokambirana

Mawu olondola ndi 1, 2 ndi 3.

8. Yang'anani chithunzicho!

Mphamvu ya kinetic ya chinthu pa mfundo B = 100 J. Ngati kulemera kwa chinthucho ndi 2,5 kg, ndiye kuti mphamvu ya kinetic ya chinthucho ikagunda pansi pa mfundo C ndi…

A. 350 J

B. 250 J

C. 150 J

D. 100 J

Zokambirana

Mphamvu ya kinetic ya chinthu ikafika pa mfundo B:

EP = mgh = (2,5)(10)(4) = 100 Joules

Mphamvu ya kinetic ya chinthu ikafika pa mfundo C:

EP = mgh

EP = (2,5)(10)(4 + 6)

EP = (2,5)(10)(10)

EP = 250 Joule

Yankho lolondola ndi B.

Gwero la funso:

Mafunso a Mayeso a Sayansi ya Sukulu ya Sekondale/Chisilamu cha Sukulu ya Sekondale

Mafunso a SBMPTN a Fizikiki